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authorGleb Natapov <gleb@redhat.com>2009-02-04 17:28:14 +0200
committerAvi Kivity <avi@redhat.com>2009-03-24 11:03:11 +0200
commit4925663a079c77d95d8685228ad6675fc5639c8e (patch)
tree52e93df78b23a44ed21d015f835688f673dd351a /arch/ia64/kvm
parent452425dbaa1974e9fc489e64a8de46a47b4c2754 (diff)
downloadblackbird-op-linux-4925663a079c77d95d8685228ad6675fc5639c8e.tar.gz
blackbird-op-linux-4925663a079c77d95d8685228ad6675fc5639c8e.zip
KVM: Report IRQ injection status to userspace.
IRQ injection status is either -1 (if there was no CPU found that should except the interrupt because IRQ was masked or ioapic was misconfigured or ...) or >= 0 in that case the number indicates to how many CPUs interrupt was injected. If the value is 0 it means that the interrupt was coalesced and probably should be reinjected. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/ia64/kvm')
-rw-r--r--arch/ia64/kvm/kvm-ia64.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index 9c77e3939e97..076b00d1dbff 100644
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -182,7 +182,7 @@ int kvm_dev_ioctl_check_extension(long ext)
switch (ext) {
case KVM_CAP_IRQCHIP:
case KVM_CAP_MP_STATE:
-
+ case KVM_CAP_IRQ_INJECT_STATUS:
r = 1;
break;
case KVM_CAP_COALESCED_MMIO:
@@ -927,6 +927,7 @@ long kvm_arch_vm_ioctl(struct file *filp,
goto out;
}
break;
+ case KVM_IRQ_LINE_STATUS:
case KVM_IRQ_LINE: {
struct kvm_irq_level irq_event;
@@ -934,10 +935,17 @@ long kvm_arch_vm_ioctl(struct file *filp,
if (copy_from_user(&irq_event, argp, sizeof irq_event))
goto out;
if (irqchip_in_kernel(kvm)) {
+ __s32 status;
mutex_lock(&kvm->lock);
- kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
+ status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
irq_event.irq, irq_event.level);
mutex_unlock(&kvm->lock);
+ if (ioctl == KVM_IRQ_LINE_STATUS) {
+ irq_event.status = status;
+ if (copy_to_user(argp, &irq_event,
+ sizeof irq_event))
+ goto out;
+ }
r = 0;
}
break;
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